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Correct some things, e.g. set mode and policy on
the cache lv, not the pool, lvm.conf field for
mode changed.
Add smq which was missing.
Make the sections on cache mode and cache policy
consistent in structure and style.
We want most of our units to be started before any local/remote mount
points are mounted - we used {local,remote}-fs.target for this purpose
before, but it was not 100% correct as there's even {local,remote}-fs-pre.target
special systemd unit reserved for this exact purpose.
See also man 7 systemd.special and "local-fs-pre.target"/"remote-fs-pre.target"
description.
Replace the histogram stats subcommand with a --histogram switch
to enable histogram related fields for both list and report output.
To avoid overloading the existing --histogram rename it to --bounds:
this is also a better description of the option.
Make sure that correct 'dmstats create' messages are shown for all
examples and fix LV examples to use correct dmsetup output name
format (vg/lv -> vg-lv).
Improve the names and labels of stats reports columns, ensure that
the minimum field widths allow unambiguos labels to be shown and
update the man page descriptions of these fields.
Add support to dmstats to create and report histograms.
Add a --histogram switch to 'create' that accepts a string
description of bin boundaries and DR_STATS and DR_STATS_META fields
to report bin configuration and absolute and relative histogram
values:
hist_bins
hist_bounds
hist_ranges
hist_count
hist_count_bounds
hist_count_ranges
hist_percent
hist_percent_bounds
hist_percent_ranges
A new 'histogram' subcommand displays a report that emphasizes
histogram data as either counters or percentage values.
When dmstats is run with -v or higher enable a per-area reporting
mode for statistics regions. This will output one row per area
(rather than one row per region) and adds additional fields of use
when viewing areas:
area_id - index within the region assigned by libdm-stats
area_start - the start location of the area in the containing
device.
Add a pair of fields to expose the current per-interval duation
estimate. The 'interval' field provides a real value in units of
seconds and the 'interval_ns' field provides the same quantity
expressed as a whole number of nanoseconds.
The '--force' switch is only used by dmstats to allow either
creation or deletion of one or more regions on all devices.
These operations do not carry any risk: just a possible mess of
region IDs to be cleaned up.
Remove the use of '--force' for stats commands and change current
uses to a new '--alldevices' switch.
Add the libdm-stats module to libdm: this implements a simple interface
for creating, managing and interrogating I/O statistics regions and
areas on device-mapper devices.
The library interface is documented in libdevmapper.h and provides a
'dm_stats' handle that is used to perform statistics operations and
obtain data.
Public methods are provided to create and destroy handles and to list,
create, and destroy statistics regions as well as to obtain and parse
counter data and calculate rate-based metrics.
This commit also adds a 'dmsetup stats' (aka 'dmstats') command with
'clear', 'create', 'delete', 'list', 'print', and 'report' sub-commands.
See the library documentation and the dmstats.8 manual page for detailed
API and command descriptions.
